To explore the riverine or atmospheric influence on the source‐sink fates of typical persistent organic pollutants (POPs): polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in the large river estuary, atmospheric and seawater samples were collected simultaneously over a whole year at a remote small island in the Yangtze River Estuary (YRE), the East China Sea. A comparable net input of BDE‐209 from the atmosphere to the sea for both air‐water gas exchange and dry/wet deposition was observed. The gas deposition of BDE‐209 had a strong dependence on the gaseous concentration, which was in turn governed by atmospheric transport. For Br_<10‐BDEs, which have been prohibited in recent years, the gas exchange almost reached equilibrium at the air‐water interface during the whole observation period. However, a strong net gas volatilization was observed for legacy Σ_ICESPCBs especially in the flood season, and the volatilization was significantly associated with ambient parameter‐wind speed. These remarkably different exchange dynamics of PBDEs and PCBs at the air‐water interface over the YRE could be attributed to their primary emission intensity and inconsistent environmental transport pathways. The reversal of the source‐sink fates of BDE‐209 and legacy PCBs suggest that the strongly human‐influenced large river estuary water could act as a source‐sink buffer for POPs during the switch from approved to prohibited usage.

中文翻译：

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受人为影响的大河口空气-水界面处典型的新兴和传统持久性有机污染物的交换动力学

为了研究河流或大气对典型持久性有机污染物（POP）的源汇命运的影响：大河口中的多溴联苯醚（PBDEs）和多氯联苯（PCBs），同时从整体上收集了大气和海水样品年是在东海长江口（YRE）的一个偏远小岛上。观察到从大气到海洋的BDE-209净输入量可用于空气-水气体交换和干/湿沉积。BDE-209的气体沉积强烈依赖于气体浓度，而气体浓度又受大气传输的支配。对于Br _<10‐BDEs，近年来被禁止，在整个观测期间，气体交换几乎在空气-水界面达到平衡。但是，在传统的_ΣICES PCB中，尤其是在洪水季节，观察到强烈的净气体挥发，并且挥发与环境参数风速显着相关。多溴联苯醚和多氯联苯在YRE的空气-水界面上的这些明显不同的交换动力学可归因于它们的主要排放强度和不一致的环境运输途径。BDE-209和旧式多氯联苯的源汇命运的逆转表明，在从批准的使用方式转换为禁止使用的过程中，受人为影响很大的大河口水可以作为持久性有机污染物的源汇缓冲。